GpuService: introduce GetGpuMemoryBufferAttribs as a mojo interface

services/ui/gpu/gpu_service.h

Index: services/ui/gpu/gpu_service.h
diff --git a/services/ui/gpu/gpu_service.h b/services/ui/gpu/gpu_service.h
index 990c488b595ae075ad7abaefa745666b2a5dc732..e0b1fc985aa47d01af49a586a0a61e7882d2fe8e 100644
--- a/services/ui/gpu/gpu_service.h
+++ b/services/ui/gpu/gpu_service.h
@@ -139,6 +139,8 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
   void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                               int client_id,
                               const gpu::SyncToken& sync_token) override;
+  void GetGpuMemoryBufferAttribs(
+      const GetGpuMemoryBufferAttribsCallback& callback) override;
   void GetVideoMemoryUsageStats(
       const GetVideoMemoryUsageStatsCallback& callback) override;
   void RequestCompleteGpuInfo(
@@ -170,6 +172,9 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
   // Information about general chrome feature support for the GPU.
   gpu::GpuFeatureInfo gpu_feature_info_;
 
+  // GpuMemoryBufferAttribs that are supported for all gfx::BufferUsage flags.
+  gfx::GpuMemoryBufferAttribVector gpu_memory_buffer_attribs_;
+
   scoped_refptr<mojom::ThreadSafeGpuHostPtr> gpu_host_;
   std::unique_ptr<gpu::GpuChannelManager> gpu_channel_manager_;
   std::unique_ptr<media::MediaGpuChannelManager> media_gpu_channel_manager_;